js中，实现对键盘按键的监听：

function keyUp> 这里输入引用文本p(e) {            var currKey=0,e=e||event;            currKey=e.keyCode||e.which||e.charCode;            var keyName = String.fromCharCode(currKey);            alert("按键码: " + currKey + " 字符: " + keyName);        }     document.onkeyup = keyUp;

alert信息例如："按键码: 81 字符: Q"